MousePad Goliathus - lighting problems

I have two Goliathus mouse pads that I purchased 2 years ago. Both over time began to lose their lighting, with one practically no longer showing anything. I know that both are not under warranty, but I bought them for a very significant price in official stores and I would like to know if there is any way to fix them.I saw on the internet that some people had the same problem after 2 years of use. I'm even willing to pay for the concert, because as I mentioned...each one cost an average of 600.00 and they were big investments, and I would like to keep using them.